Self Service pages showing error after upgrading 11i to r12.2

You have encountered an unexpected error. Please contact the System Administrator for assistance R12.2

when clicking on any function.

Exception Details.

oracle.apps.fnd.framework.OAException: Could not create Java class: (dib.oracle.apps.per.selfservice.appraisals.webui.DibEmpMyAppraisalsInProgressCO) associated with region: (ApprProgressRN). This is probably because the class name is wrong or not included in project. at oracle.apps.fnd.framework.webui.OAPageErrorHandler.prepareException(Unknown Source) at oracle.apps.fnd.framework.webui.OAPageErrorHandler.processErrors(Unknown Source) at oracle.apps.fnd.framework.webui.OAPageBean.processRequest(OAPageBean.java:2773) at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:1949) at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:548) at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:436) at _pages.__oa._jspService(__oa.java:233) at weblogic.servlet.jsp.JspBase.service(JspBase.java:34) at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227) at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:301) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:184) at weblogic.servlet.internal.RequestDispatcherImpl.invokeServlet(RequestDispatcherImpl.java:526) at weblogic.servlet.internal.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:253) at weblogic.servlet.jsp.PageContextImpl.forward(PageContextImpl.java:159) at _pages.__oa._jspService(__oa.java:246) at weblogic.servlet.jsp.JspBase.service(JspBase.java:34) at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227) at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:301) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:184) at weblogic.servlet.internal.RequestDispatcherImpl.invokeServlet(RequestDispatcherImpl.java:526) at weblogic.servlet.internal.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:253) at weblogic.servlet.jsp.PageContextImpl.forward(PageContextImpl.java:159) at _pages.__rf._jspService(__rf.java:235) at weblogic.servlet.jsp.JspBase.service(JspBase.java:34) at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227) at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:301) at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:60) at oracle.apps.jtf.base.session.ReleaseResFilter.doFilter(Unknown Source) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:60) at oracle.apps.fnd.security.AppsServletFilter.doFilter(AppsServletFilter.java:386) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:60) at